A few years ago friends of mine got some wireless rear speakers from Sony. They had to order them in and they required connection to a power jack on the other side of the room. Similar to these - http://www.sony.co.nz/product/waht-sbp1 - but the main stereo amp had to be compatible.

I have just used cat-5 for speaker cable in a few places around the house - not via the RJ45's however. Just grabbedall the whites for - and all the colours for +. rears are low power so should be fine on that too.

The sony rear speakers were annoyingI used to install them in the home theatre kits for customers when I worked at the local retravision.

Basically you had 2 choices in rear speaker - Infrared so whenever someone walked between the transmitter and one of the speakers, the sound cut out - 2.4ghz usually analog so they screwed with your wifi network

Also alot of them still require a cable because the reciever is only in one of the rear speakers.

Ray TaylorTaylor Broadband (rural hawkes bay)www.ruralkiwi.com

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They sound as if they could be quite good, BUT they only have a line-level input which will limit the receivers that they could be used with.

The following is an extract from a cnet review of the speakers in 2007:

The only connectivity available is a single pair of line-level RCA inputs. That means the transmitter will interface with any piece of audio/video gear with an analog A/V output or even just a headphone jack (a minijack-to-RCA adapter cable is included). Unfortunately, the single stereo connection limits the usefulness of the entire On Air Control system when connecting to A/V receivers. Whether you want to use the On Air Control 2.4G speakers as the rear channels in a 5.1- or 7.1-channel surround system, as front stereo speakers, or as Zone 2 speakers in another room, your A/V receiver will need to have preamplifier outputs. The problem is few moderately priced ($500 and less) receivers are so equipped. Why JBL engineers didn't include speaker level inputs on the transmitter to ensure universal compatibility is impossible to fathom, and we guess the RCA-only input scheme might be a deal breaker for some potential buyers.

raytaylor: Also alot of them still require a cable because the reciever is only in one of the rear speakers.

That's right most require speaker cable running between the left and right rear speakers, and a power cable to either left or right rear as well. But they do eliminate the most annoying cable(s) from the receiver at the front to the rear speakers.

Yes, the RCA only inputs are a bit of a deal breaker. I don't have a problem finding power near the speakers, it's more that I don't want to have to pull wire to the other end of the room for the surround speakers. However, it's starting to look like that's just what I'm going to have to do!